Cloud point depressants for middle distillate fuels

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 1/18 (2006.01) C10L 1/196 (2006.01) C10L 1/22 (2006.01) C10L 1/236 (2006.01)

Patent

CA 2374945

An additive for distillate and a fuel composition having improved cloud point depressant properties. The additive is incorporated into a major proportion of distillate fuel and is a maleic anhydride .alpha.-olefin copolymer or a polyimide having structure (I): wherein R has at least 80 % by weight of a hydrocarbon substituent from about 14 to about 16 carbons, X is oxygen or N-R' wherein N is nitrogen and R' has at least 80 % by weight of a hydrocarbon substituent from 16 to 18 carbons, and n is from about 2 to about 30 when X is oxygen, and from about 2 to about 17 when X is N-R'. Alternatively, the cloud point additive can be an ethylene vinyl acetate isobutylene terpolymer.

L'invention concerne un additif de distillat et une composition de combustible présentant des caractéristiques améliorées de point de trouble. On incorpore cet additif dans une grande proportion de l'huile combustible. L'additif se compose d'un copolymère anhydride maléique-.alpha.-oléfine ou d'un polyimide présentant la structure (I), dans laquelle R comprend à raison d'au moins 80 % en poids un substituant hydrocarbure possédant de 14 à 16 atomes de carbone, X est l'oxygène ou N-R', N étant l'azote et R' comprenant à raison d'au moins 80 % en poids un substituant hydrocarbure possédant de 16 à 18 atomes de carbone, et n est un nombre compris entre 2 et 30 environ lorsque X est l'oxygène, et entre 2 et 17 environ lorsque X est N-R'. Dans une forme différente, l'additif peut être un copolymère triple éthylène-acétate de vinyle-isobutylène.

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